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Why are some user name formatted user########, is this linked with unregistered users and if does a unregistered status appear on every unregistered users profile?

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I removed all of the comments here because they were really tedious and got in the way of the answer, which I believe answers both the long and short forms of this question and thus should be an end to this. – Shog9 Jun 26 '13 at 19:20
up vote 6 down vote accepted

user1231231 usernames are generated by the system if you don't choose your own display name when you sign up. It is unrelated with being registered or not.

You can see whether a user is registered or not in their profile. Unregistered users have "unregistered" right beside their name.

Here's an example from Unix & Linux:

enter image description here

That's an unregistered user that chose a username. You can find plenty of registered users on Stack Overflow that didn't change their display name from the default user314159.

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Thanks Mat, I know it's a bit of a basic question, I am strange, and like to understand the small things, as much as the big things – user223277 Jun 26 '13 at 18:51
Worth to mention the users list as well as the Data Explorer show only registered users; only the dev team and diamond moderators can search in the full list. – Shadow Wizard Jun 26 '13 at 19:28

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